Baby rats head's and tail's don't really ever "match."   A baby rats tail is changing while figuring out the circumference of its head. While being a baby rat, you grow and develop more and more until you've grown to an adult rat. Baby rats are constantly changing so it is hard to determine a ratio of a baby rats tail to the circumference of it head. So the ratio would be constantly changing. To find the circumference of a baby rats head multiply the distance of it's head (one way across) times pi. To find out the measurement of its tail, you would (most likely) use a ruler and measure. 
     Where baby rats are constantly changing it really is hard to determine a perfect ratio. Once the baby rats have grown into adult rats, then a ratio would be easier to find, but even then rats are still changing. Just not as much. Humans are like this too, so are all other living things. We all change, grow, and develop in some party of our lives... it's one of the 6 characteristics of life. The only difference is... rats can't eat ice cream!




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